AutoCodes – Chevrolet – U18AD Chevrolet

U18AD Chevrolet Code - Transmission Range Control Module Lost Communication With Electronic Brake Control Module On Chassis Expansion CAN Bus

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U18AD Chevrolet indicates Transmission Range Control Module Lost Communication With Electronic Brake Control Module On Chassis Expansion CAN Bus.
Common causes: Common causes include Faulty Electronic Brake Control Module (EBCM), Electronic Brake Control Module harness is open or shorted, Electronic Brake Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 477

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U18AD Chevrolet Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18AD Chevrolet - Transmission Range Control Module Lost Communication With Electronic Brake Control Module On Chassis Expansion CAN Bus - AutoCodes.com — U18AD Chevrolet Code - Transmission Range Control Module Lost Communication With Electronic Brake Control Module On Chassis Expansion CAN Bus

What does this mean?

What are the Possible Causes of the DTC U18AD Chevrolet?

Faulty Electronic Brake Control Module (EBCM)
Electronic Brake Control Module harness is open or shorted
Electronic Brake Control Module circuit poor electrical connection

How to Fix the DTC U18AD Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U18AD Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U18AD Chevrolet Code

1. What are common symptoms of OBDII code U18AD in a Chevrolet related to the Transmission Range Control Module?

- Common symptoms include transmission shifting issues, erratic or harsh gear changes, and warning lights on the dashboard related to the transmission system.

2. What can cause the U18AD code in a Chevrolet indicating a lost communication between the Transmission Range Control Module and Electronic Brake Control Module?

- Possible causes include damaged wiring or connectors between the modules, a faulty Transmission Range Control Module, an issue with the Electronic Brake Control Module, or a problem with the chassis expansion CAN bus.

3. How can I diagnose the U18AD code in my Chevrolet related to the Transmission Range Control Module communication issue?

- Diagnosis typically involves using a professional OBDII scanner to retrieve the specific code, checking the wiring and connectors between the modules for damage, and testing the modules themselves for proper functionality.

4. Is it safe to drive my Chevrolet with the U18AD code present indicating a communication problem between the Transmission Range Control Module and Electronic Brake Control Module?

- It is not recommended to drive the vehicle with this code present, as it can lead to potential transmission issues and safety concerns due to the loss of communication between critical control modules.

5. Can I repair the U18AD code in my Chevrolet related to the Transmission Range Control Module communication problem myself?

- Repairing this code usually requires advanced diagnostic tools and knowledge of automotive electrical systems. It is recommended to seek assistance from a professional mechanic or dealership for proper diagnosis and repair.

6. Are there any temporary fixes or reset procedures for the U18AD code in a Chevrolet?

- Performing a reset by disconnecting the vehicle's battery for a few minutes may temporarily clear the code, but it is essential to address the underlying communication issue between the modules to prevent future problems.

7. How much does it typically cost to repair the U18AD code in a Chevrolet involving the Transmission Range Control Module and Electronic Brake Control Module?

- The cost of repair can vary depending on the exact cause of the communication issue and the labor rates of the repair shop. It is advisable to obtain a few quotes from different mechanics to determine the best course of action.

8. Can the U18AD code in a Chevrolet be a recurring issue even after repair?

- If the root cause of the communication problem is not properly addressed during the repair process, the U18AD code may reappear. It is crucial to ensure that all related components are thoroughly inspected and repaired to prevent recurrence.